cpu hotplug-是否有系统调用禁用linux中的cpu? [英] cpu hotplug - is there a system call to disable a cpu in linux?

问题描述

Linux具有启用/禁用cpu的" cpu hotplug "功能.

Linux has 'cpu hotplug' feature of enabling/disabling a cpu .

我想从C程序禁用计算机的cpus之一，所以我的问题是-怎么做?有可能吗?

I want disable one of the computers' cpus from a C program , so my question is - how? is it possible ?

在这里，我发现了以下内容:

Here I found the following :

问:我如何在逻辑上使CPU脱机?

Q: How do i logically offline a CPU?

A:请执行以下操作: #echo 0>/sys/devices/system/cpu/cpuX/online

A: Do the following: #echo 0 > /sys/devices/system/cpu/cpuX/online

尽管Coudlnt在本文档中找到了有关系统调用的任何内容，所以希望有人能对此有所启发，谢谢！

Coudlnt find anything about system calls though in this document , so hopefully someone can shed some light about this, Thanks !

推荐答案

在linux中没有用于禁用cpu的系统调用.您所发现的文章是唯一的方法.但是您可以将shell脚本重写为以下内容:

There is no syscall for disabling a cpu in linux. What you found article is the only method. But you can rewrite the shell script to the below:

static void set_cpu_online(int cpu, int online)
{
        int fd;
        int ret;
        char path[256];

        snprintf(path, sizeof(path) - 1,
                 "/sys/devices/system/cpu/cpu%d/online", cpu);

        fd = open(path, O_RDWR);
        assert(fd > 0);

        ret = write(fd, "0" + (online ? 1 : 0), 1);
        assert(ret == 1);
}

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